f6a9e91057
Only in the non-critical region， nuttx can the respond to the irq and not hold the lock When returning from the irq, there is no need to check whether the lock needs to be restored test: We can use qemu for testing. compiling make distclean -j20; ./tools/configure.sh -l qemu-armv8a:nsh_smp ;make -j20 running qemu-system-aarch64 -cpu cortex-a53 -smp 4 -nographic -machine virt,virtualization=on,gic-version=3 -net none -chardev stdio,id=con,mux=on -serial chardev:con -mon chardev=con,mode=readline -kernel ./nuttx Signed-off-by: hujun5 <hujun5@xiaomi.com>
130 lines
4.4 KiB
C
130 lines
4.4 KiB
C
/****************************************************************************
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* arch/sparc/src/sparc_v8/sparc_v8_doirq.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <assert.h>
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#include <nuttx/addrenv.h>
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#include <nuttx/irq.h>
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#include <nuttx/arch.h>
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#include <nuttx/board.h>
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#include <arch/board/board.h>
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#include <sched/sched.h>
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#include "sparc_internal.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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uint32_t *sparc_doirq(int irq, uint32_t *regs)
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{
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board_autoled_on(LED_INIRQ);
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#ifdef CONFIG_SUPPRESS_INTERRUPTS
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PANIC();
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#else
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regs = (uint32_t *)((uint32_t)regs + CPU_MINIMUM_STACK_FRAME_SIZE);
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/* Current regs non-zero indicates that we are processing an interrupt;
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* CURRENT_REGS is also used to manage interrupt level context switches.
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*
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* Nested interrupts are not supported.
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*/
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DEBUGASSERT(CURRENT_REGS == NULL);
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CURRENT_REGS = regs;
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/* Deliver the IRQ */
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irq_dispatch(irq, regs);
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/* Check for a context switch. If a context switch occurred, then
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* CURRENT_REGS will have a different value than it did on entry.
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* If an interrupt level context switch has occurred, then restore
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* the floating point state and the establish the correct address
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* environment before returning from the interrupt.
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*/
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if (regs != CURRENT_REGS)
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{
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#ifdef CONFIG_ARCH_FPU
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/* Restore floating point registers */
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up_restorefpu((uint32_t *)CURRENT_REGS);
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#endif
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#ifdef CONFIG_ARCH_ADDRENV
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/* Make sure that the address environment for the previously
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* running task is closed down gracefully (data caches dump,
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* MMU flushed) and set up the address environment for the new
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* thread at the head of the ready-to-run list.
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*/
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addrenv_switch(NULL);
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#endif
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/* Record the new "running" task when context switch occurred.
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* g_running_tasks[] is only used by assertion logic for reporting
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* crashes.
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*/
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g_running_tasks[this_cpu()] = this_task();
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}
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/* If a context switch occurred while processing the interrupt then
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* CURRENT_REGS may have change value. If we return any value different
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* from the input regs, then the lower level will know that a context
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* switch occurred during interrupt processing.
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*/
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regs = (uint32_t *)((uint32_t)CURRENT_REGS -
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CPU_MINIMUM_STACK_FRAME_SIZE);
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/* Set CURRENT_REGS to NULL to indicate that we are no longer in an
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* interrupt handler.
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*/
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CURRENT_REGS = NULL;
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#endif
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board_autoled_off(LED_INIRQ);
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return regs;
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}
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